Happy National Sibling Day! (Yes, this actually exists.)
As much as parents would never admit it, there's usually one sibling that they bond with more than the others. The same thing happens in Hollywood as well, but the public is a little more blatant about their preference. There are plenty of super-famous celebrities with brothers or sisters you've never heard of, despite many of them making earnest efforts to get into the public eye. And while they've been able to ride the coattails of their siblings to an acting spot here and there, it's safe to say they won't become bona fide A-listers anytime soon.
Check out our roundup of 11 black sheep celebrity siblings after the jump!